It is concluded that the observed devolatilisation behaviour of the four tyre rubbers is in good agreement with what was expected from the literature. All rubbers show two distinct zones of devolatil- isation, either as a main peak with a shoulder (NR, PI and SBR) or as two well separated peaks in the case of BR. These two zones were correlated with depolymerisation/condensation of the rubbers and degradation of the condensed intermediate product, respectively. Whereas the two zones for the two polyisoprene rubbers are consistently endothermic, in case of the butadiene rubbers they are also different in apparent heat of reaction. The exo- and endother- micity of the two subsequent devolatilisation zones of these latter rubbers were correlated with the predominance of recombination (condensation) and fragmentation reactions, respectively.